Boston Omaha (SKYH holder) sells 360,000 Sky Harbour shares

Rhea-AI Filing Summary

Boston Omaha Corporation filed an amended beneficial ownership report for Sky Harbour Group Corp’s Class A common stock. On August 11, 2026, Boston Omaha sold 360,000 Class A shares at $10.00 per share, generating $3,600,000 in gross proceeds under an effective registration statement.

After this sale, Boston Omaha beneficially owns 18,699,773 Class A shares, including 7,719,779 Warrant Shares, representing 40.45% of the outstanding Class A stock and 21.18% of the combined voting power of all common stock, based on 38,510,234 Class A and 42,046,356 Class B shares outstanding as of August 12, 2026. This holding includes shares owned through its indirect subsidiary United Casualty and Surety Insurance Company, with investment decisions made by Boston Omaha’s investment committee.

Filing Explained

The amendment identifies Sky Harbour’s completed issuance of 4,000,000 Class A shares as a cause of Boston Omaha’s lower ownership percentage; the added shares increase the total share count and dilute existing holders’ percentage ownership.

Key Figures

Shares sold: 360,000 shares Sale price per share: $10.00 per share Gross sale proceeds: $3,600,000 +5 more

8 metrics

Shares sold 360,000 shares Class A Stock sold by Boston Omaha on August 11, 2026

Sale price per share $10.00 per share Price for 360,000 Class A shares sold on August 11, 2026

Gross sale proceeds $3,600,000 Total gross proceeds from sale of 360,000 Class A shares

Beneficially owned Class A (incl. warrants) 18,699,773 shares Boston Omaha’s beneficial ownership of Class A Stock including Warrant Shares

Class A common shares held 10,979,994 shares Underlying Class A Stock held by Boston Omaha excluding Warrant Shares

Warrant Shares 7,719,779 shares Shares of Class A Stock issuable upon exercise of warrants held by Boston Omaha

Ownership of Class A Stock 40.45% Boston Omaha’s percentage of outstanding Class A Stock after the sale

Combined voting power 21.18% Voting power of Boston Omaha’s holdings relative to all common stock

Key Terms

beneficial ownership, Warrant Shares, combined voting power, registration statement, +1 more

5 terms

beneficial ownership financial

"The Reporting Person's beneficial ownership represents 40.45% of the outstanding Class A Stock"

Beneficial ownership means the person or entity that actually enjoys the benefits of owning shares or other assets — such as receiving dividends, voting rights, or price gains — even if the legal title is held in another name. For investors it matters because knowing who truly controls and profits from a company reveals who can influence decisions, exposes potential conflicts of interest or hidden concentration of power, and affects transparency and risk in the stock.

Warrant Shares financial

"warrants exercisable for 7,719,779 shares of Class A Stock ("Warrant Shares") held by the Reporting Person"

Warrant shares are the company stock that can be issued when holders exercise warrants — contracts that give someone the right to buy shares at a set price. Think of a coupon that lets you buy a product later at today’s price; if the market price rises above that set price, the coupon gains value and new shares are created. Investors care because issuing warrant shares can change ownership percentages, raise cash for the company, and offer leveraged upside or extra dilution depending on how the market moves.

combined voting power financial

"The Reporting Person's beneficial ownership represents 40.45% of the outstanding Class A Stock and 21.18% of the combined voting Common Stock"

registration statement regulatory

"sold an aggregate of 360,000 shares of Class A Stock at a price of $10.00 per share, for total gross proceeds of $3,600,000, pursuant to an effective registration statement"

A registration statement is a formal document that companies file with a government agency to offer new shares of stock to the public. It provides essential information about the company's finances, operations, and risks, helping investors make informed decisions. Think of it as a detailed product description that ensures transparency and trust before buying into a company.

Prospectus Supplement regulatory

"based on 38,510,234 outstanding shares of Class A Stock of the Issuer, as of August 12, 2026, as reported by the Issuer in its Prospectus Supplement"

A prospectus supplement is an additional document provided alongside a company's main offering details, offering updated or extra information about a specific financial product being sold. It helps investors understand the latest terms, risks, and details of the investment, similar to how an update or revision clarifies or expands on original instructions, ensuring they have current and complete information before making a decision.

FAQ

What change in Sky Harbour (SKYH) ownership did Boston Omaha report?

Boston Omaha reported a reduced stake after selling 360,000 Class A shares of Sky Harbour. Following the transaction, it beneficially owns 18,699,773 Class A shares (including Warrant Shares), representing 40.45% of Class A and 21.18% of combined voting power.

How many Sky Harbour (SKYH) shares did Boston Omaha sell and at what price?

Boston Omaha sold 360,000 shares of Sky Harbour Class A stock at $10.00 per share. The sale produced total gross proceeds of $3,600,000 and was executed pursuant to an effective registration statement under the Securities Act of 1933.

What is Boston Omaha’s remaining Sky Harbour (SKYH) Class A stake after the sale?

After the sale, Boston Omaha beneficially owns 18,699,773 Class A shares, including 7,719,779 Warrant Shares. This represents 40.45% of Sky Harbour’s outstanding Class A stock based on 38,510,234 Class A shares outstanding as of August 12, 2026.

What voting power does Boston Omaha hold in Sky Harbour (SKYH) after this amendment?

Boston Omaha’s 18,699,773 Class A shares provide 21.18% combined voting power in Sky Harbour. This is calculated relative to 38,510,234 Class A and 42,046,356 Class B shares outstanding, with each share of both classes entitled to one vote.

How are Boston Omaha’s Sky Harbour (SKYH) holdings structured?

Boston Omaha’s position consists of 10,979,994 Class A shares and 7,719,779 Warrant Shares. It also includes 2,673,831 Class A shares held via its indirect subsidiary United Casualty and Surety Insurance Company, over which Boston Omaha exercises investment and voting authority.

Did Boston Omaha report other recent Sky Harbour (SKYH) trades in this period?

Aside from the 360,000-share sale on August 11, 2026, Boston Omaha stated that neither it nor the persons listed in Item 2 had effected other transactions in Sky Harbour Class A stock during the last 60 days, as reflected in the amendment.

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Available on EDGAR 08/13/2026 - 09:44 PM Accepted by SEC EDGAR 08/13/2026 - 09:43 PM Learn about SEC filing dates

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13D

Under the Securities Exchange Act of 1934

(Amendment No. 6)

Sky Harbour Group Corp

(Name of Issuer)

Class A common stock, par value $0.0001 per share

(Title of Class of Securities)

83085C107

(CUSIP Number)

Joshua P. Weisenburger
Boston Omaha Corporation, 1601 Dodge Street, Suite 3300
Omaha, NE, 68102
(402) 201-2073

(Name, Address and Telephone Number of Person Authorized to Receive Notices and Communications)

08/11/2026

(Date of Event Which Requires Filing of This Statement)

If the filing person has previously filed a statement on Schedule 13G to report the acquisition that is the subject of this Schedule 13D, and is filing this schedule because of §§ 240.13d-1(e), 240.13d-1(f) or 240.13d-1(g), check the following box.

The information required on the remainder of this cover page shall not be deemed to be "filed" for the purpose of Section 18 of the Securities Exchange Act of 1934 ("Act") or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).

schemaVersion:

SCHEDULE 13D

CUSIP Number(s): 83085C107

1

Name of reporting person

BOSTON OMAHA Corp

2

Check the appropriate box if a member of a Group (See Instructions)

(a)
(b)

3

SEC use only

4

Source of funds (See Instructions)

OO

5

Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)

6

Citizenship or place of organization

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

7	Sole Voting Power 18,699,773.00
8	Shared Voting Power
9	Sole Dispositive Power 18,699,773.00
10	Shared Dispositive Power

11

Aggregate amount beneficially owned by each reporting person

18,699,773.00

12

Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)

13

Percent of class represented by amount in Row (11)

40.5 %

14

Type of Reporting Person (See Instructions)

CO

Comment for Type of Reporting Person:

(1) For Items 7, 9 and 11, comprised of 10,979,994 shares of the Issuer's (as defined below) Class A common stock, par value $0.0001 (the "Class A Stock"), and warrants exercisable for 7,719,779 shares of Class A Stock ("Warrant Shares") held by the Reporting Person, each as of August 13, 2026, constituting 40.45% of Class A common stock.. Based on all shares of the Issuer outstanding, represents 21.18% beneficial ownership of the combined voting Class A common stock and Class B common stock. (2) For Item 13, calculated based on the shares of Class A Stock, including Warrant Shares, beneficially owned by the Reporting Person relative to the Issuer's 38,510,234 outstanding shares of Class A Stock, as of August 12, 2026, as reported in the Issuer's Prospectus Supplement filed with the SEC on August 12, 2026, plus the 7,719,779 Warrant Shares owned by the Reporting Person.

SCHEDULE 13D

Item 1.	Security and Issuer
(a)	Title of Class of Securities: Class A common stock, par value $0.0001 per share
(b)	Name of Issuer: Sky Harbour Group Corp
(c)	Address of Issuer's Principal Executive Offices: 36 Tower Road, Suite 205, Westchester County Airport, White Plains, NEW YORK , 10604.
Item 1 Comment: This Amendment No. 6 to Schedule 13D (this "Amendment No. 3") amends and supplements the Schedule 13D filed with the U.S. Securities and Exchange Commission (the "SEC") on February 4, 2022, as amended and supplemented by (i) Amendment No. 1 to Schedule 13D, filed with the SEC on May 21, 2024, (ii) Amendment No. 2 to Schedule 13D, filed with the SEC on May 31, 2024, (iii) Amendment No. 3 to Schedule 13D, filed with the SEC on February 14, 2025, (iv) Amendment No. 4 to Schedule 13D, filed with the SEC on April 28, 2025, and (v) Amendment No. 5 to Schedule 13D, filed with the SEC on April 8, 2026 (as so amended and supplemented, the "Schedule 13D"). As further described in Item 4, this Amendment No. 6 is being filed in connection with the sale of shares of Class A Stock by the Reporting Person. Each capitalized term used but not defined herein has the meaning ascribed to such term in the Schedule 13D.
Item 2.	Identity and Background
(a)	This Schedule 13D is being filed by Boston Omaha Corporation, a Delaware corporation (the "Reporting Person"), and includes 2,673,831 shares of Class A Stock held by its indirect, wholly-owned subsidiary United Casualty and Surety Insurance Company. All investment and voting decisions for the Class A Stock held by the Reporting Person are made by the Reporting Person based on the consent of its investment committee, comprised of Mr. Adam K. Peterson and Mr. Joshua P. Weisenburger, each of whom expressly disclaims any beneficial ownership of the reported securities other than to the extent of any pecuniary indirect interest he may have therein as a stockholder of the Reporting Person. Current information concerning the identity and background of the directors and officers of the Reporting Person is set forth in Exhibit 2.1 attached hereto, which is incorporated by reference to this Item 2.
(b)	The principal business address of the Reporting Person is 1601 Dodge Street, Suite 3300, Omaha, NE 68102.
(c)	The principal business of the Reporting Person is outdoor advertising, surety insurance and broadband communication services.
(d)	During the last five years, neither the Reporting Person nor, to the best of the Reporting Person's knowledge, any other person identified in Schedule 2.1 has been (i) convicted in a criminal proceeding (excluding traffic violations or similar misdemeanors) or (ii) a party to a civil proceeding of a judicial or administrative body of competent jurisdiction and as a result of such proceeding was or is subject to a judgment, decree or final order enjoining future violations of, or prohibiting or mandating activities subject to, federal or state securities laws or finding any violation with respect to such laws.
Item 4.	Purpose of Transaction
	Item 4 of the Schedule 13D is hereby supplemented as follows: On August 11, 2026, the Reporting Person sold an aggregate of 360,000 shares of Class A Stock at a price of $10.00 per share, for total gross proceeds of $3,600,000, pursuant to an effective registration statement under the Securities Act of 1933, as amended. As a consequence, the Reporting Person's beneficial ownership decreased to 18,699,773 shares of Class A Stock (including the 7,719,779 Warrant Shares). The Reporting Person's beneficial ownership represents 40.45% of the outstanding Class A Stock and 21.18% of the combined voting Common Stock, a decrease primarily caused by such sale by the Reporting Person of 360,000 shares of Class A Stock on August 11, 2026 and the issuance of 4,000,000 shares of Class A common stock by the Issuer. A schedule of the sale transaction by the Reporting Person is attached hereto as Exhibit 4.1.
Item 5.	Interest in Securities of the Issuer
(a)	Item 5 of the Original Schedule 13D is hereby amended and restated in its entirety as follows: (a) - (b) The following sets forth, as of the date of this Amendment No. 6, the aggregate number of shares of Issuer's Class A Stock and percentage of Class A Stock (including Warrant Shares) beneficially owned by the Reporting Person, and which the Reporting Person has the sole or shared power to vote or to direct the vote, sole or shared power to dispose or to direct the disposition of, as of the date hereof, based on 38,510,234 outstanding shares of Class A Stock of the Issuer, as of August 12, 2026, as reported by the Issuer in its Prospectus Supplement filed with the SEC on August 12, 2026 plus the Warrant Shares. The following also sets forth the combined voting power of the 18,699,773 shares of Class A Stock (including Warrant Shares) beneficially owned by the Reporting Person relative to the Issuer's total outstanding Common Stock, as to which the Reporting Person has the sole or shared power to vote or to direct the vote, and sole or shared power to dispose or to direct the disposition of, as of the date hereof, based on 38,510,234 shares of the Issuer's Class A Stock and 42,046,356 shares of the Issuer's Class B Stock issued and outstanding as of August 12, 2026, as reported by the Issuer in its Prospectus Supplement filed with the SEC on August 12, 2026, plus the Warrant Shares. Reporting Person: Boston Omaha Corporation: Class A Common Stock: Number (1) 18,669,773; Percent (2) 40.45% Class B Common Stock: Number - ; Percent - Combined Voting Power (%) (3): 21.18% (1)cConsists of 10,979,994 shares of Class A Stock and 7,719,779 Warrant Shares held by the Reporting Person. (2) Beneficial ownership overall is calculated based on the shares of Class A Stock, including Warrant Shares, beneficially owned by the Reporting Person relative to the Issuer's 38,510,234 outstanding shares of Class A Stock, as of August 12, 2026, as reported by the Issuer in its Prospectus Supplement filed with the SEC on August 12, 2026, plus the 7,719,779 Warrant Shares. (3) Calculated based on the shares of Class A Stock, including Warrant Shares, beneficially owned by the Reporting Person relative to the Issuer's 38,510,234 outstanding shares of Class A Stock and 42,046,356 outstanding shares of Class B Stock, as of August 12, 2026, as reported by the Issuer in its Prospectus Supplement filed with the SEC on August 12, 2026, plus the 7,719,779 Warrant Shares. Holders of Class A Stock and Class B Stock are entitled to one vote per share on all matters submitted to the stockholders for their vote or approval.
(b)	Item 5 of the Original Schedule 13D is hereby amended and restated in its entirety as follows: (a) - (b) The following sets forth, as of the date of this Amendment No. 6, the aggregate number of shares of Issuer's Class A Stock and percentage of Class A Stock (including Warrant Shares) beneficially owned by the Reporting Person, and which the Reporting Person has the sole or shared power to vote or to direct the vote, sole or shared power to dispose or to direct the disposition of, as of the date hereof, based on 38,510,234 outstanding shares of Class A Stock of the Issuer, as of August 12, 2026, as reported by the Issuer in its Prospectus Supplement filed with the SEC on August 12, 2026 plus the Warrant Shares. The following also sets forth the combined voting power of the 18,699,773 shares of Class A Stock (including Warrant Shares) beneficially owned by the Reporting Person relative to the Issuer's total outstanding Common Stock, as to which the Reporting Person has the sole or shared power to vote or to direct the vote, and sole or shared power to dispose or to direct the disposition of, as of the date hereof, based on 38,510,234 shares of the Issuer's Class A Stock and 42,046,356 shares of the Issuer's Class B Stock issued and outstanding as of as of August 12, 2026, as reported by the Issuer in its Prospectus Supplement filed with the SEC on August 12, 2026, plus the Warrant Shares. (1) Consists of 10,979,994 shares of Class A Stock and 7,719,779 Warrant Shares held by the Reporting Person. (2) Calculated based on the shares of Class A Stock, including Warrant Shares, beneficially owned by the Reporting Person relative to the Issuer's 38,510,234 outstanding shares of Class A Stock, as of August 12, 2026, as reported by the Issuer in its Prospectus Supplement filed with the SEC on August 12, 2026, plus the 7,719,779 Warrant Shares. (3) Calculated based on the shares of Class A Stock, including Warrant Shares, beneficially owned by the Reporting Person relative to the Issuer's 38,510,234 outstanding shares of Class A Stock and 42,046,356 outstanding shares of Class B Stock, as of August 12, 2026, as reported by the Issuer in its Prospectus Supplement filed with the SEC on August 12, 2026, plus the 7,719,779 Warrant Shares. Holders of Class A Stock and Class B Stock are entitled to one vote per share on all matters submitted to the stockholders for their vote or approval.
(c)	Except as described elsewhere in this Amendment No. 6, including in Item 4 and Exhibit 4.1 incorporated herein by reference, during the past 60 days, neither the Reporting Person nor, to the knowledge of the Reporting Person, any person named in Item 2 hereof, have effected any transactions with respect to the Issuer's Class A Stock
(d)	No person other than the Reporting Person is known to have the right to receive, or the power to direct the receipt of dividends from, or proceeds from the sale of, the shares of the Issuer's Class A Stock.
(e)	Not applicable.
Item 6.	Contracts, Arrangements, Understandings or Relationships With Respect to Securities of the Issuer
	The information in Item 5 of this Amendment No. 6 is incorporated by reference into this Item 6.
Item 7.	Material to be Filed as Exhibits.
	Exhibit 2.1 Schedule of Officers and Directors Exhibit 4.1 Schedule of Transactions for Item 4 and Item 5(c) of Amendment No. 6.

SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

BOSTON OMAHA Corp

Signature:	/s/ Joshua P. Weisenburger
Name/Title:	Joshua P. Weisenburger, Chief Financial Officers
Date:	08/13/2026